/*
 * Copyright 2020-2024 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.security.oauth2.server.authorization.authentication;

import java.io.Serializable;
import java.util.Collections;

import org.springframework.security.authentication.AbstractAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.util.Assert;

/**
 * An {@link Authentication} implementation used for the OAuth 2.0 Token Exchange Grant
 * to represent an actor in a composite token (e.g. the "delegation" use case).
 *
 * @author Steve Riesenberg
 * @since 1.3
 * @see OAuth2CompositeAuthenticationToken
 */
public class OAuth2ActorAuthenticationToken extends AbstractAuthenticationToken implements Serializable {

	private final String name;

	public OAuth2ActorAuthenticationToken(String name) {
		super(Collections.emptyList());
		Assert.hasText(name, "name cannot be empty");
		this.name = name;
	}

	@Override
	public Object getPrincipal() {
		return this.name;
	}

	@Override
	public Object getCredentials() {
		return null;
	}
}
